KR102253921B1 - Pnematic tire - Google Patents

Abstract

An embodiment of the present invention provides a pneumatic tire, and more particularly, a pneumatic tire capable of reducing noise and having a stone ejector function by applying a protrusion including an air path to a rear surface of a tire main groove.
The pneumatic tire according to the embodiment of the present invention is composed of a tread part, a sidewall part, and a bead part, the tread part includes a groove, and is formed in the circumferential direction of the tire on the bottom of the groove, and air is supplied inside to reduce noise. It includes; a protrusion having a flowing air pass portion.

Description

Pneumatic tire {PNEMATIC TIRE}

The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire capable of having a noise reduction effect and a stone ejector function by applying a protrusion including an air path to the rear surface of the tire main groove. .

Conventional techniques for reducing tire noise include a method of inserting a sound absorbing agent or inserting a protrusion into a groove surface.

In Korean Patent Laid-Open No. 10-2015-0123684 (name of the invention: resonance noise reduction tire), a sound absorbing agent is inserted into the inner part of the tire to reduce the cavity noise to reduce noise. There is a problem in that a process of attaching a sound absorbing agent to the inside of the tire is additionally required. In addition, there are a lot of technologies related to sound absorbing agents in the related art, and the burden of weight is large for application to heavy-duty tires.

In addition, in Korean Patent Registration No. 10-1301585 (name of the invention: a pneumatic tire with improved hydro planning and noise reduction performance), a protrusion is inserted into the groove surface to reduce noise and improve hydro planning performance. The protrusion-inserted tire on the groove surface has protrusions located on the wall surface of the groove in repeated cycles. The role of the protrusion is a technology that prevents cracks on the side of the groove and smoothes the flow of fluid due to the shape of the protrusion. When the shape of the technology is applied to heavy-duty tires, the area of the groove bottom surface is narrow, which is likely to cause groove cracking. In addition, if a stone is caught between the section where the groove space becomes narrower and the section becomes wider, it is a shape that makes it difficult for the stone to escape. Therefore, when applied to a heavy-duty tire, the problem of deteriorating durability performance may be greater than performance improvement.

Republic of Korea Patent Publication No. 10-2015-0123684 Korean Patent Registration No. 10-1301585

An object of the present invention for solving the above problems is to add a new type of protrusion on the side and bottom of the groove to facilitate the flow of fluid and to add a stone ejector function. Air Path accelerates the flow of air when the tire rotates circumferentially, and through this, it allows air to escape to the space when the tire is grounded and induces noise reduction effect.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

The configuration of the present invention for achieving the above object is composed of a tread portion, a sidewall portion and a bead portion, wherein the tread portion is a pneumatic tire including a groove, wherein the tread portion is formed in the tire circumferential direction on the bottom surface of the groove, It characterized in that it comprises a; a protrusion having an air pass portion through which air flows in order to reduce noise.

In an embodiment of the present invention, it is preferable to include a first air path connected to an inlet of the air path and a second air path connected to an outlet of the air path.

In addition, the cross-sectional shape of the protrusion is preferably formed in a trapezoidal or triangular shape.

In addition, it is preferable that the height of the protrusion is 5 to 20% of the depth of the groove.

In an embodiment of the present invention, the protrusion may be formed continuously in a wave pattern on the circumference of the tire.

The effect of the present invention according to the configuration as described above is to improve the function of the stone ejector while smoothing the flow of fluid by adding a new type of protrusion to the side and bottom of the groove.

The air path accelerates the flow of air when the tire rotates circumferentially, and through this, air can escape into the space when the tire is grounded to the ground. Through this, air is easier to escape than tires with only the existing stone ejector, and noise generated when air collides with the stone ejector can be reduced.

Conventionally, stone ejectors in the form of a rectangular parallelepiped were mostly used. If the present invention is applied compared to a stone ejector consisting of a single body, the movement of the stone ejector increases, so it is easy to discharge the stone.

The effects of the present invention are not limited to the above effects, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a perspective view of a main part of a tread part according to an embodiment of the present invention.
Figure 2 is a cross-sectional view of the main part of the tread according to an embodiment of the present invention.
3 is a side view, a cross-sectional view, and a plan view of a protrusion according to an exemplary embodiment of the present invention.
4 is a perspective view of a main part of a tread part according to another embodiment of the present invention.
5 is a plan view of a main part of a tread part according to another embodiment of the present invention.
6 is a cross-sectional view of a main part of a tread according to another embodiment of the present invention.
7 is a side view of a protrusion according to an embodiment of the present invention.
8 is a comparison diagram of a protrusion according to another embodiment of the present invention and a conventional stone ejector.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and therefore is not limited to the exemplary embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, bonded)" with another part, it is not only "directly connected", but also "indirectly connected" with another member in the middle. "Including the case. In addition, when a part "includes" a certain component, this means that other components may be further provided, not excluding other components, unless specifically stated to the contrary.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the case of heavy-duty tires mainly traveling on unpaved roads, a bump occurs in which stones are pinched between grooves. If a stone is caught in the groove while driving, friction and impact occur between the stone and the groove bottom and the sidewall of the groove, and this impact and friction generate cracks in the tire, and the generated crack grows to shorten the life of the tire. There will be a problem that makes it happen. Thus, a stone ejector has been installed in the groove of the tire tread so that the stone can be easily discharged when the stone is caught in the groove.

Such stone ejectors include a groove bottom protruding ejector formed as a protrusion at the bottom of the groove, and a side wall protruding ejector installed on the sidewall of the groove. It is formed so that when a stone touches the stone ejector, the stone is pushed out and discharged by the counter-elastic force of the stone ejector. However, such a stone ejector has a disadvantage that its counter-elasticity is not sufficient, and in particular, when a small stone is stuck, its effect is small.

The present invention relates to a pneumatic tire, and by adding a new type of protrusion to a side surface and a bottom surface of a groove to smooth the flow of a fluid, a noise reduction effect can be obtained, and a stone ejector function can be performed at the same time.

1 is a perspective view of a main part of the tread part 100 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part of the tread part 100 according to an embodiment of the present invention, and FIG. A side view, a cross-section, and a plan view of the protrusion 300 of the tread part 100 according to an exemplary embodiment.

The pneumatic tire of the present invention is composed of a tread portion 100, a sidewall portion, and a bead portion, and the tread portion 100 includes a groove 200, and is formed on the bottom surface of the groove 200 in the tire circumferential direction, Includes; a protrusion having an air path portion 310 through which air flows in order to reduce noise. Through this configuration, it is possible to provide a stone ejecting function and at the same time reduce noise generated during stone ejection.

Here, the air pass unit 310 is connected to the inlet 321 of the air pass unit and extends to the center of the air pass unit 310 based on the circumferential direction of the tire. It is preferable to include a second air pass 330 connected to the outlet 331. The air pass unit 310 speeds up the flow of air when the tire rotates circumferentially, so that when the tire is grounded on the ground, air may escape into the corresponding space. Through this, air is easier to escape than tires with only a stone ejector, and noise generated when air collides with the stone ejector can be reduced.

In addition, the cross-sectional shape of the protrusion 300 may be formed in a trapezoidal or triangular shape. When the width of the upper surface of the protrusion 300 is the same as the width of the lower surface, interference with the groove 200 may occur during the flexion movement of the tire, so that the upper surface width of the protrusion 300 is formed smaller than the lower surface width. The cross-sectional shape of the protrusion 300 may be closer to a triangle in a trapezoidal shape. In addition, it is preferable that the height of the protrusion 300 is 5 to 20% of the depth of the groove 200.

In addition, the protrusion 300 may be formed continuously in a wave pattern on the circumference of the tire. The arrangement that is continuously formed in a wave pattern on the circumference of the tire can be applied in the case of long-distance products. In this case, since most of the products applied with the rib-type pattern are applied, the protrusion 300 is connected and applied, and if stones are caught in a state where the overall stiffness balance is maintained, the restoring force is that the protrusion 300 is connected rather than the separated form. Better, it can increase the stone ejection effect.

The protrusion 300 has the following dimensions, including the 3D Kerf 340, and the arrangement of the protrusion 300 can be applied in two ways.

First, by arranging one tread portion 100 within the same pattern interval, the interval between the protrusion portions 300 may be equal intervals. As shown in FIG. 3, A denotes the length of the top surface of the protrusion part 300, and is set to 1/4 to 1/2 of the length of the same pattern interval of the tread part 100. B is the length of the bottom surface of the protrusion 300, and has a length extending 4 to 10 millimeters compared to A. C is the width of the bottom surface of the protrusion 300, and can be changed according to the width of the rear end of the groove 200, and D is the width of the upper surface of the protrusion 300, and may be 10 to 90% of the width of the lower end, and In the case of 90 to 100 percent, interference with the groove 200 surface may occur during the flexion (屈伸) movement of the tire, and the cross-sectional shape of the protrusion 300 may be close to a triangle from a trapezoid according to the size of D. H is the height of the protrusion 300 and is preferably 5 to 20 percent of the depth of the groove 200. E is the diameter of the inlet 321 (the part where air enters) of the air pass part of the protrusion 300, which is 1/3 of H, and E'is the diameter of the outlet 331 of the air path part of the protrusion part (the part where air comes out). It is 120% of the G denotes the depth of the 3D kerf 340 and is 1/3 of H, and M denotes the depth of the groove 200.

Second, it is a method of arranging the protrusions 300 by continuously connecting them in a wave pattern on the circumference of the tire. Here, A and B are connected to the lower surface of the circumferential groove 200, and their lengths may be different for each tire standard. C, D, E, E'and G are the same as those of the first one, and H is the height of the protrusion 300, which may be 5 to 20 percent of M, so that a difference can be made in the height.

If the top width (D) of the protrusion 300 is too wide or the height (H) is too high, it adversely affects the drainage performance, and the top width (D) of the protrusion 300 is too narrow or the height (H) is too high. If it is low, the stone ejecting function cannot be exhibited, so the range of these can be limited as shown above.

4 is a perspective view of a main part of the tread part 100 according to another embodiment of the present invention, FIG. 5 is a plan view of the main part of the tread part 100 according to another embodiment of the present invention, and FIG. It is a cross-sectional view of the main part of the tread part 100 according to another embodiment. In addition, FIG. 7 is a side view of a protrusion 300 according to an embodiment of the present invention, and FIG. 8 is a comparison view of the protrusion 300 according to another embodiment of the present invention and a conventional stone ejector 400.

When the protrusion 300 is arranged by connecting in a circumferential shape, it may have a shape as shown in FIG. 4. In the case of using the pneumatic tire according to an embodiment of the present invention, it is possible to expect a noise reduction effect and an improvement in a stone ejecting function. When the tire is folded, a hollow cylindrical space with a cylindrical or square cross section is created. The flow velocity of air passing through the space can be expressed by the following equation.

V: air flow rate (㎧)

Qa: Actual flow rate of air (㎥/min)

d: Pipe inner diameter

When the tire is grounded with the ground, it is in the form of a pipe, but it is not circular, so when applying the equation, the cross-sectional area of the space where air is located should be entered as the denominator. In addition, the two-stage diameter in the duct is to reduce noise generated through the flow of air. If the area of the duct is wider, the noise can be reduced by the reverberation. In addition, if the shape of FIG. 7 is applied in the form of a diffuser without sharpening the area where the area becomes wider, it is possible to prevent the formation of turbulence in the flow path and bring about a noise reduction effect.

In addition, due to the improvement of the stone ejecting function, the conventional stone ejector 400 had a rectangular parallelepiped shape, but if the protrusion 300 of the technology is applied compared to the stone ejector made of one body, the movement of the protrusion 300 increases. It can be easy to dispose of the stone.

More specifically, the protrusion 300 formed on the bottom of the groove 200 is provided with an air pass part 310 so that the protrusion 300 is not only flexed easily, but also has an enhanced counter-elasticity due to a large distance to be flexed. There is an effect that the stones stuck in (200) are relatively easily removed. In addition, by making a difference in the diameter of the inlet 321 and the outlet 331 of the air pass portion 310 formed on the protrusion 300, a 3D cuff 340 is provided to further increase the degree of deflection of the protrusion 300. The stone ejecting function can be made easier by increasing the distance and anti-elasticity.

The shape of the protrusion can be selected according to the use of the tire.

First, the equal spacing can be applied to products for medium and short distances. Rib type pattern applied products can be applied to the main groove. In addition, the block-type pattern applied product can be applied between the main groove or each block. Since rolling and traction are repeated for medium and short distance products, the movement of the protrusion in the width direction and the circumferential direction may be large.

Second, the arrangement of continuous connection on the circumference of the tire can be applied in the case of long-distance products. In this case, since most products are applied with a rib pattern, the corresponding protrusions 300 can be connected and applied. In the case of a rib-shaped pattern in which the overall rolling of the tire is maintained for a long time, when stones are caught in a state in which the overall stiffness balance is maintained, the protrusion 300 is connected to have a better restoring force, so that the stones can be easily discharged.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100: tread part
200: groove
300: protrusion
310: Air pass section
320: first air pass
321: Entrance of the air pass part
330: 2nd air pass
331: exit of the air pass part
340: 3D cuff
400: conventional stone ejector

Claims (5)

In a pneumatic tire comprising a tread portion, a sidewall portion and a bead portion, the tread portion including a groove,
And at least one protrusion disposed one by one within the same pattern interval of the tread portion and formed in the tire circumferential direction on the bottom surface of the groove so as to be spaced apart at equal intervals, and the upper portion opposite to the bottom surface of the groove is separated in the tire circumferential direction; and,
The protrusion,
And an air pass portion formed to penetrate the inner central portion of the protrusion in the circumferential direction of the tire, exposed to the outside through both ends of the protrusion, and through which air flows therein to reduce noise, and
The protrusion has a square truncated cone shape in which a length of an upper surface of the protrusion is shorter than a length of a lower surface of the protrusion,
Both side surfaces of the protrusion are formed in a trapezoidal shape inclined to form an acute angle with the lower surface of the protrusion,
The air pass unit,
A first air path extending from one side of the air path part to the center of the air path part along the circumferential direction of the tire; And
And a second air pass extending from the center of the first air pass to the other side, which is an outlet of the air pass unit,
A pneumatic tire, characterized in that the diameter of the first air path is smaller than the diameter of the second air path.
The method according to claim 1,
The length of the upper surface of the protrusion is 1/4 to 1/2 of the same pattern spacing of the tread part,
The length of the lower surface of the protrusion is formed to be 4mm to 10mm longer than the length of the upper surface of the protrusion,
The width of the bottom surface of the protrusion is formed to correspond to the width of the bottom surface of the groove,
The width of the upper surface of the protrusion is formed to be 10% to 90% of the width of the lower surface of the protrusion,
A pneumatic tire, characterized in that the height of the protrusion is formed to be 5% to 20% of the depth of the groove.
The method according to claim 2,
The diameter of the first air path is 1/3 of the height of the protrusion,
The diameter of the second airpath is 120% of the diameter of the first airpath,
Further comprising a 3D cuff inserted into the protrusion separated in the circumferential direction of the tire,
A pneumatic tire, characterized in that the depth of the 3D cuff is 1/3 of the height of the protrusion.
In a pneumatic tire comprising a tread portion, a sidewall portion and a bead portion, the tread portion including a groove,
At least one protrusion formed continuously on the bottom surface of the groove in the tire circumferential direction, and wherein an upper portion of the protrusion facing the bottom surface of the groove is separated in the tire circumferential direction; and
The protrusion,
An air pass portion formed to penetrate the inner central portion of the protrusion in the circumferential direction of the tire, exposed to the outside through both ends of the protrusion, and through which air flows therein to reduce noise; And
It includes a 3D cuff coupled to a surface facing each other at the top of the protrusion,
The length of the upper surface of the protrusion is formed to be shorter than the length of the lower surface of the protrusion,
The protrusion has a square truncated cone shape,
Both side surfaces of the protrusion are inclined to form an acute angle with the lower surface of the protrusion,
Both sides of the protrusion are formed in a trapezoidal shape,
The air pass unit,
A first air path extending from one side of the air path part to the center of the air path part along the circumferential direction of the tire; And
And a second air pass extending from the center of the first air pass to the other side, which is an outlet of the air pass unit,
A pneumatic tire, characterized in that the diameter of the first air path is smaller than the diameter of the second air path.
The method of claim 4,
The flow rate of air passing through the air pass portion is,

(v = air flow rate, Qa is the actual flow rate of air, d is a pneumatic tire, characterized in that calculated by the pipe inner diameter).

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